NOTES ON THE STENOGYRINJE. Vll 



SUBFAMILY STENO GYRING. 



This very extensive subfamily, comprising 29 genera and 

 about 500 species, has not before been made the subject of 

 monographic research, and although a few of the genera have 

 been carefully studied, there has yet been no adequate classi- 

 fication of the group. 



Anatomical data are still lacking on many of the genera, 

 and very few have been sufficiently investigated. A division 

 of the subfamily into five series of genera or phyla is indi- 

 cated by data presented in this and the preceding volumes. 

 Three of these phyla are represented in Africa, Asia and 

 America. The phyla are as follows: 



I. Subulina phylum. IV. Rumina phylum. 



II. Leptinaria phylum. V. Obeliscus phylum. 



III. Opeas phylum. 



Of these, phyla I, II and III are closely related, and to- 

 gether form a group systematically equivalent to either of 

 the others. 



I. Subulina phylum. 



The shell varies from ovate to turrite, the latter being the 

 prevalent contour. The columella is truncate basally, acha- 

 tinoid, and the summit is bulbous and hemispherical with 

 few exceptions. 



The genera are as follows: 



America. Africa. 



Subulina. Subulina. 



Luntia. Ceras. 



Tornaxis. Homorus. 



Pseudoglessula. 



8. E. Asia. Chilonopsis. (St. Helena). 



Bacillum. Bocageia ( -f- Petriola) . 



The positions of Luntia and Tornaxis are still uncertain. 

 Their soft anatomy is unknown, and I have not seen the shells. 

 They may possibly be Oleacinoid. Bacillum seems most akin 



